WiNRADiO Future of radio

  AX-G400-PF Patch Feeder for L-Band Dish
AX-G400-PF Patch Feeder

  L-Band frequency range
  Left Hand Circular Polarization
  Phase adjustment capability
  N-Type Connector
  50 Ohm Impedance
  8.5 dBi Gain
  Suited for dish with 0.35 - 0.4 f/D ratio
The WiNRADiO WR-AX-G400-PF patch feeder is an L-Band feeder designed for a 1690 - 1710 MHz frequency range, with a -3dB beamwidth of 85. Optimum performance is achieved when it is mounted as a prime focussed feeder onto a dish with a f/D ratio of 0.35 to 0.4. Operating the feeder under these conditions, a VSWR of typically 1:1.15 can be expected mid-band.

The feeder expects a left hand circularly polarized (LHCP) signal, i.e. an RHCP inbound signal before being reflected off the dish. The silver plated patch antenna is fitted with a "tuning slug" (set screw), which can be used to fine-tune the LHCP signal phase for optimum performance. However, this should not be necessary, as the feeder is shipped pre-tuned for the operating frequency band.

The feeder interface has an impedance of 50 Ohm and is provided via an N-type female connector. The feeder sub-reflector is constructed from aluminium and is powder coated for environmental protection. The N-Type connector and high density polyethylene cover are sealed against water ingress.

Three 4 mm studs are provided for mounting the device, with the studs located on a circle with radius 52 mm and spaced apart equally at 120°

If the WR-AX-G400-PF patch feeder is mounted onto the WR-AX-400D 120cm dish, the antenna system will have an overall gain of 24 dBi, with the -3 dB main lobe beamwidth of 11, while the side lobes are at least 25 dB below the main lobe.

Technical Specifications
Model WR-AX-G400-PF
Type Patch Antenna
Frequency Range 1690 - 1710 MHz
Polarization LHCP (RHCP optional by design)
Gain 8.5 dBi
-3 dB Beamwidth 85 degrees
-10 dB Beamwidth 125-130 degrees
SWR 1:1.15 at 1698 MHz
Suitable f/D 0.35 to 0.4
Connector N-Type Female
Impedance 50 Ohm
Size D = 164 mm (6.45"), H = 40 mm (1.57")
Construction Aluminium, powder coated
Colour Beige
Mounts Three 4 mm (0.16") studs, on circle R = 52mm (2.04"), 120° apart

Antenna System Performance (with WR-AX-400D dish)
L-Band Gain 24 dBi
Main Lobe Beamwidth 11 degrees @ -3 dB
Side Lobes 25 to 30 dB below main lobe

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